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Topic: New Madrid Seismic Zone

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In the News (Mon 22 Apr 19)

  New Madrid Seismic Zone - Wikipedia, the free encyclopedia
The New Madrid fault system was responsible for the 1812 New Madrid Earthquake and has the potential to produce damaging earthquakes on an average of every 300 to 500 years.
Earthquake of February 7, 1812 (the New Madrid Earthquake), 0945 UTC (4:45 a.m.); 7.9 magnitude; epicenter near New Madrid, Missouri.
Comparison: the 1895 Charleston, Missouri, earthquake in the New Madrid seismic zone with the 1994 Northridge, California, earthquake.
en.wikipedia.org /wiki/New_Madrid_Seismic_Zone   (1280 words)

 New Madrid earthquakes still threaten the central United States, scientists conclude: 9/00
During the winter of 1811 to 1812, the sparsely populated New Madrid, Mo., area was jolted by a series of three powerful earthquakes now estimated to have been of magnitude 7.5 to 8.3.
But the New Madrid is an "intraplate fault" located in the middle of the North American plate, not at the boundary.
Most quakes in the area occur in the New Madrid seismic zone (shown in red), but assessing seismic risk is difficult because the New Madrid fault zone is deeply buried by thick layers of sediment.
news-service.stanford.edu /news/2000/october4/newmadrid-104.html   (1119 words)

 Welcome to IEMA   (Site not responding. Last check: 2007-11-04)
The New Madrid seismic zone (NMSZ) extends more than 120 miles southward from Cairo, Illinois, at the junction of the Mississippi and Ohio rivers, into Arkansas and parts of Kentucky and Tennessee.
The zone is active, averaging about 200 earthquakes per year, though most of them are too small to be felt.
With modern seismic networks, the capability to detect earthquakes has greatly increased, and many more very small earthquakes are being detected now than in the past.
www.state.il.us /iema/disaster/e_newmadrid.htm   (582 words)

 Rift Zone 11:2002 EXPLORER   (Site not responding. Last check: 2007-11-04)
One piece of this evidence, according to Reed, is the apparent connection of the New Madrid seismic zone with the Gulf rift features to the south.
If the New Madrid seismic zone is indeed part of a triple juncture, he continued, there should be an expression of this limb trending along a line in a northeast direction.
The earthquakes in the New Madrid seismic zone and other locations along the theorized rift zone that cuts across the United States as well as the Middleton Place-Summerville seismic zone in South Carolina are tied to the tectonic movement in the Gulf of Mexico Basin, he said.
www.aapg.org /explorer/2002/11nov/rift_zone.cfm   (1904 words)

 CUSEC - Seismic Zones - NMSZ
The 400 terrified residents in the town of New Madrid (Missouri) were abruptly awakened by violent shaking and a tremendous roar.
The crew of the New Orleans (the first steamboat on the Mississippi, which was on her maiden voyage) reported mooring to an island only to awake in the morning and find that the island had disappeared below the waters of the Mississippi River.
Strong earthquakes in the New Madrid Seismic Zone are certain to occur in the future.
www.cusec.org /S_zones/NMSZ/nmsz_home.htm   (1026 words)

 ScienceDaily: New Madrid Fault Study In Midwest Indicates Large Earthquake A Threat
The potential for a large earthquake along the New Madrid seismic zone in the central Mississippi Valley should be considered a serious threat, according to a new study spearheaded by a University of Colorado at Boulder professor.
New USGS Map Highlights Central U.S. Earthquake History (April 12, 2004) -- A new map from the U.S. Geological Survey and the Central United States Earthquake Consortium shows that Central States, including Arkansas, Tennessee, Missouri, Kentucky and Indiana are among the...
New Madrid Seismic Zone -- The New Madrid Seismic Zone, also known as the Reelfoot Rift or the New Madrid Fault Line, is a major seismic zone located in the Midwestern United...
www.sciencedaily.com /releases/1999/11/991105073728.htm   (2080 words)

 CUSEC - Wabash Valley Seismic Zone
Recent studies have indicated that the New Madrid Seismic Zone is not the only 'hot spot' for earthquakes in the Central United States.
On June 18, 2002, a 5.0 magnitude earthquake struck the Evansville, Indiana with an epicenter between Mt. Vernon and West Franklin in Posey County, in an area that is part of the Wabash Valley Seismic Zone.
The Wabash Valley Seismic Zone is located in Southeastern Illinois and Southwestern Indiana and it is capable of producing 'New Madrid' size earthquake events.
www.cusec.org /S_zones/Wabash/index.htm   (380 words)

 The New Madrid Seismic Zone.
A New Madrid Fault rupture this size would be felt throughout half the United States and damage expected in 20 states or more.
The Great New Madrid Earthquake of 1811-12 was actually a series of over 2000 shocks in five months, five of which were 8.0 or more in magnitude.
It was the largest burst of seismic energy east of the Rocky Mountains in the history of the U.S. and was several times larger than the San Francisco quake of 1905.
www2.semo.edu /ces/CES2.HTML   (871 words)

 New Madrid Earthquake Seismic Zone Maps p3
The southernmost strike-slip is called the Blytheville seismic zone and runs at least 70 miles from Arkansas through Missouri and into Tennessee.
Radiocarbon dating of wood in the remains of ancient seismic features, including old sand blowouts, suggest that significant earthquakes occurred in the New Madrid system between 780 and 1000 AD, 1180 and 1650 AD, and 4,000 to 5,000 years ago.
Magnetic measurements and studies of seismic waves that pass through the subsurface bedrock of the region indicate that the rocks around the New Madrid system have not been overly deformed over the past 300 million years.
www.showme.net /~fkeller/quake/maps3.htm   (525 words)

 New Madrid Seismic Zone - Home
The New Madrid earthquake of 1811 was the most cataclysmic event that the United States has ever experienced.
The New Madrid seismic zone is located in the middle of the country, running basically in a line from southern Illinois through New Madrid, Missouri and ending in east central Arkansas.
In a masterly crafted 30 minute documentary John traveled the NMSZ and interviewed many of the areas leading geologists, seismologists, historians and others.
newmadridfaultzone.com   (305 words)

 Sandboils, magnitude, intensity, movement New Madrid Seismic Zone
Seismic activity in Missouri is more ike hitting the bass drum in the middle: It can resonate to Boston.
Given the uncertainties in dating liquefaction features, the time between the past three New Madrid events may be as short as 200 years and as long as 800 years, with an average of 500 years.
It appears that fault rupture was complex and that the central branch of the seismic zone produced very large earthquakes during the A.D. 900 and A.D. 1450 events as well as in 1811–1812.
www.showme.net /~fkeller/quake/movement.htm   (1207 words)

 New Madrid Seismic Zone: Overview of Earthquake Hazard and Magnitude Assessment Based on Fragility of Historic ...   (Site not responding. Last check: 2007-11-04)
Seismic hazard assessments affect building code design requirements (i.e., mapped design ground motions), construction guidelines, building costs, insurance rates, expected consequences of future earthquake activity, and regional economies as a whole.
The study aims to communicate the level of uncertainties involved in the seismic hazard assessment procedures and their impact on the assignment of seismic design ground motions and categories and to provide recommendations regarding implications associated with adoption or modification of newer seismic hazard provisions found in the IBC-2000 and IRC-2000.
This high level of seismic hazard is evidenced by large earthquakes that have repeatedly occurred in the past reaching destructive magnitudes.
www.huduser.org /publications/destech/newmadrid.html   (376 words)

 USATODAY.com - Hints of quake under central USA   (Site not responding. Last check: 2007-11-04)
The sleeping giant of American earthquake faults, the New Madrid zone in the middle of the country, may be showing new signs of activity.
The New Madrid (pronounced MAD-rid) zone is the most seismically active region east of the Rocky Mountains.
But the New Madrid fault, named for a frontier Missouri village rocked by powerful quakes in the winter of 1811-12, hasn't had a big one since.
www.usatoday.com /news/nation/2005-08-07-new-madrid-hints-quake_x.htm   (1125 words)

 Intraplate Strain Accumulation in the New Madrid Seismic Zone
The NMSZ is located within a failed rift that was active about 600 million years ago, followed by period of magmatic reactivation and igneous intrusion of mafic plutons 80 to 60 million ago.
This network was reoccupied by GPS in 1993 and 1997 and stations were added to better span the southern seismic zone and the western rift boundary (Figure 30.1).
E seismic trend yields 0.7 parallel and -0.6 mm/yr perpendicular components, which is opposite of that predicted by simple elastic strain dislocation models that assume zero far-field deformation and backslip on the faults defined by seismic and paleoseismic studies.
www.seismo.berkeley.edu /seismo/annual_report/ar02_03/node34.html   (1186 words)

 Introduction to New Madrid   (Site not responding. Last check: 2007-11-04)
The New Madrid Seismic zone lies within the central Mississippi Valley, extending from northeast Arkansas, through southeast Missouri, western Tennessee, western Kentucky to southern Illinois.
The New Madrid seismic zone is so named because the town of New Madrid, Missouri was the closest settlement to the epicenters of the 1811-1812 quakes.
The potential for the recurrence of such earthquakes and their impact today on densely populated cities in and around the seismic zone, has generated much research devoted to understanding earthquakes.
www.eas.slu.edu /Earthquake_Center/SEISMICITY/NewMadridGeneral.html   (355 words)

 The Virtual Times: The New Madrid Earthquake
The next time the New Madrid Fault produces such a quake, it is estimated 60 percent of Memphis will be devastated, leaving $50 Billion in damage and thousands of dead in its wake.
Panther-across-the-sky: Tecumseh & the New Madrid Earthquake, 1811/12
Landslide scarps in Chickasaw Bluffs Landslide scarps in Chickasaw Bluffs, east of Reelfoot Lake, New Madrid earthquake.
hsv.com /genlintr/newmadrd   (1397 words)

 1999 Young Naturalist Awards | American Museum of Natural History
These seismic waves are the cause of the huge fissures that opened up, such as the ones that Ben Chartier and his family had to "coon" across.
Each year the New Madrid Seismic Zone is shaken by an average of 200 minor (magnitudes 3.0-4.0 on the Richter scale) earthquakes.
After the New Madrid Earthquakes of 1811-1812, those residents of the affected states that still remained in the area took as direct an action as they knew to prevent the recurrence of the "wrath of God"—they joined churches and repented for their sins.
www.amnh.org /nationalcenter/youngnaturalistawards/1999/hagenauer.html   (2710 words)

 New Madrid earthquake - Wikipedia, the free encyclopedia
The New Madrid Earthquake, the largest earthquake ever recorded in the contiguous United States, occurred on February 7, 1812.
The earthquakes are therefore to be traced to seismic activity 5 to 25 km below the crust of the earth.
Understanding of this earthquake zone is growing only slowly, in comparison to awareness of the San Andreas fault, and must be increased in the face of an ongoing earthquake danger that affects the East and Midwest of the USA.
en.wikipedia.org /wiki/New_Madrid_Earthquake   (1477 words)

 UMR News and Research: New UMR study details threats in New Madrid seismic zone
Commissioned by the U.S. Federal Highway Administration, the study represents the first systematic investigation in the vicinity of the New Madrid seismic zone involving seismologists, geologists, geotechnical and structural engineers, and economists, says Dr. Neil Anderson, professor of geological sciences and engineering at UMR and director of the NHMI.
The New Madrid fault is an active seismic zone that includes southeast Missouri and extends into southern Illinois, northeast Arkansas, and parts of Kentucky and Tennessee.
Although ground shaking at bedrock in the vicinity of the New Madrid fault for a given magnitude earthquake is estimated to be stronger than predicted by current models, this energy is now believed to decrease more rapidly with distance than previously thought.
news.umr.edu /research/2005/NewMadridStudy0905.html   (624 words)

 New Madrid 03:2003 EXPLORER   (Site not responding. Last check: 2007-11-04)
They did some seismic reflection work across the area, which did identify a fault in the deep subsurface, but the fault could not be imaged in the shallower sediments.
During the second earthquake, one that is widely recognized throughout the New Madrid seismic zone and dated to about 1470 AD, both faulting and liquefaction caused additional subsidence west of the fault.
This movement is consistent with the seismic zone regionally.
www.aapg.org /explorer/2003/03mar/newmadridfault.cfm   (1809 words)

 riverfronttimes.com | News | ON SHAKY GROUND
But the one recognized cataclysmic source in the state is the New Madrid seismic zone, a 120-mile-long system of faults that traverses the Missouri Bootheel and cuts across five adjacent state lines.
It is named after the small town of New Madrid, Mo., which bore the brunt of the earthquakes that beset the region early in the last century.
Scientists reckon the New Madrid quakes to be among the largest seismic bursts in the history of the United States.
www.riverfronttimes.com /issues/1999-12-15/feature.html   (1004 words)

 Geotimes - February 2003 - New Madrid seismic zone
Now geologists have upgraded a suspected rupture area in the New Madrid seismic zone to fault status, marking a surface fault in a region where earthquake hazard maps currently identify the extent of potential danger zones principally by seismic activity.
Students Danny Fitzgerald and Erica Doerr of the University of Arkansas drill cores for research on the New Madrid seismic zone.
The lack of seismicity along the Bootheel fault lends an air of mystery to the region however.
www.geotimes.org /feb03/NN_madrid.html   (881 words)

 New Madrid Seismic Zone: Space Geodesy and Earthquake Hazard
A different picture emerges from the new study thatwe conducted with colleagues from the University of Missouri, the University of Miami Geodesy Lab and Grand Valley State University, with funding from NASA and technical assistance from the University NAVSTAR Consortium (UNAVCO), national consortium of universities supporting GPS research.
The new results illustrate that estimates of seismic hazard in the area, such as the hazard map, should be reduced.
The New Madrid Seismic Zone is in the center of the North American plate.
www.earth.northwestern.edu /people/seth/research/nmsz.html   (1340 words)

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